77231880 has 240 divisors, whose sum is σ = 286777260. Its totient is φ = 18627840.

The previous prime is 77231873. The next prime is 77231893. The reversal of 77231880 is 8813277.

It can be written as a sum of positive squares in 2 ways, for example, as 72488196 + 4743684 = 8514^2 + 2178^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 391942 + ... + 392138.

Almost surely, 2^77231880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77231880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143388630).

77231880 is an abundant number, since it is smaller than the sum of its proper divisors (209545380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77231880 is a wasteful number, since it uses less digits than its factorization.

77231880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 77231880 is about 8788.1670443842. The cubic root of 77231880 is about 425.8587113278.

The spelling of 77231880 in words is "seventy-seven million, two hundred thirty-one thousand, eight hundred eighty".